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Copy-protected compact disc and method for producing same

Active Publication Date: 2006-12-19
MACROVISION +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0011]The present application relates to a copy-protected compact disc and a method for producing the optical disc and preventing unauthorized copying. The system and method of copy protection also protects CD-R discs and prevents their being extracted on to a personal computer(PC).
[0012]There is thus provided, in accordance with an embodiment of the present invention, an optical disc having at least one session, which includes a lead-in having a plurality of subcoding blocks. Each of the plurality of subcoding blocks includes an item in channel Q, which may include at least a Point (PT), Adr / Ctrl, Pmin, Psec and Pframe. The Point of at least one of the plurality of subcoding blocks is identical to the Point in at least one other of the plurality of subcoding block and the value of at least one of a group including Adr / Ctrl, Pmin, Psec and Pframe in at least one of the plurality of subcoding blocks may differ from the value of at least one of the corresponding group of Adr / Ctrl, Pmin, Psec and Pframe in at least one other of the plurality of subcoding blocks.

Problems solved by technology

Alternatively, the misleading or invalid value may indicate that the starting time of the track is invalid or misleading.

Method used

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  • Copy-protected compact disc and method for producing same
  • Copy-protected compact disc and method for producing same
  • Copy-protected compact disc and method for producing same

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Embodiment Construction

[0063]The present application relates to a copy-protected compact disc and a method for producing the disc and preventing unauthorized copying. The present invention provides an improved method that changes the contents of any lead-in item in any optical disc so that it is no longer uniform, as described in embodiments of the present invention, hereinbelow, so that the copied disc becomes effectively corrupted and unplayable.

[0064]Reference is now made to FIGS. 1a–1e which schematically represent the structure of a compact disc (CD) having uniform lead-ins. The exemplary disc is shown, for purposes of clarity and simplicity only, as having two sessions: Session 1 with three audio tracks (tracks 1–3), followed by Session 2 containing a single data track (track 4).

[0065]FIG. 1b illustrates the structure of the lead-in for session 1, showing that the lead-in is composed of uniform Table of Contents (TOCs) consisting of A0, A1, A2 and track pointers, that are repeated throughout the len...

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PUM

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Abstract

A copy-protected compact disc and a method for producing the optical disc and preventing unauthorized copying is provided. In one embodiment, the contents of at least one of the lead-in items in the optical disc are altered so that it is no longer uniform, thereby making a copied disc effectively corrupted and unplayable.

Description

RELATED APPLICATIONS[0001]This application claims priority from U.S. Provisional Application Ser. No. 60 / 336,179, filed Dec. 6, 2001, entitled “Copy Protected Digital Audio Compact Disc, and Method and System for Producing Same”, U.S. Provisional Application Ser. No. 60 / 344,040, filed Jan. 3, 2002, entitled “A Method and system for Copy Prevention of Compact Discs” and U.S. Provisional Application Ser. No. 60 / 351,416, filed Jan. 28, 2002, entitled “A Copy Protected Compact Disc and Method for Producing Same”, all applications of which are hereby incorporated by reference herein in its entirety.FIELD OF THE INVENTION[0002]The present invention relates to copy protection, and, more particularly, to a method and system for the copy protection of audio compact discs (CDs).BACKGROUND OF THE INVENTION[0003]Both computer software and digital audio recordings are commonly recorded on to compact discs (CDs). Computers, such as personal computers (PCs) read audio CDs differently than do consu...

Claims

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Application Information

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IPC IPC(8): G11B7/007G11B20/00
CPCG11B20/00086G11B20/00202G11B20/00615G11B20/0063G11B20/00956
Inventor HAHN, YEHUDA
Owner MACROVISION